Nut-lock.



R. A. & H. D. BOWSER. I NUT LOGK.

APPLIOAIIION FILED 00124, 1912. RENEWED DEC. 2, 1913.

1,083,725. Patented Jan. 6, 1914.

WITNESSES IN vENToRs V BYWMQMW 6 ATTORNEY.

cOLUMBlA PLANOORAPH C0,. WASHINGTON. D, c

NTTED STATES PAT FEM ROY A. BOWSER AND HAMILTON D. BOWSER, OF NEWKENSINGTON, PENNSYLVANIA.

NUT-LOCK.

Application filed ()ctober 24, 1912, Serial No. 727,545.

Specification of Letters Patent.

To all whom it may concern.

Be it known that we, ROY A. Bowsnn and HAMILTON D. Bowsnn, citizens ofthe United States, residing at New Kensington, in the county ofVVestmoreland and State of Pennsylvania, have invented certain new anduseful Improvements in Nut-Locks, of which the following is aspecification.

Our invention consists of an improvement in nut locks and has for itsobject to provide a nut having an inserted key so designed and mountedwithin a specially formed and designed cavity within the nut to operateto rotate with the nut free of engagement with the threads in theoperation of screwing the nut upon the bolt, but to immediately biteinto the threads of the bolt with increasing force upon reverse movementof the nut, whereby to positively make an interlocking bindingengagement against removal.

Preferred forms of the construction are illustrated in the accompanyingdrawings, in which Figure 1 is a sectional view showing the threadedportions of the bolt and a nut thereon provided with our improvement,indicated by the line I. I. of Fig. 2. Fig. 2 is a plan view of theconstruction shown inFig. 1. Fig. 3 is a sectional View similar to Fig.1, at right angles thereto, showing the locking key in elevation and inoperative position with relation to the threads of the bolt. Fig. d is aplan View similar to Fig. 2, illustrating the action of the device inunscrewing. Fig. 5 is a similar plan view illustrating the use of asupplemental looking key or Wedge for the purpose of holding the mainlocking key out of binding engagement with the threads. Fig. 6 is asectional view similar to Fig. 1 showing the use of a modifiedconstruction of locking key, having a serrated or threaded edge. Fig. 7is a plan view of the construction shown in Fig. 6. Fig. 8 is aperspective detail view of such modified form of locking pin.

The device is intended to be used in connection with an ordinary nut,either square or hexagonal, cut out as hereinafter described, and withan ordinary bolt. As shown, the nut 2 is provided with a longitudinalcavity 3 cut through the depth of the nut from one side to the other atone side of the ordinary threaded bolt opening for the bolt 4. Thecavity 3 is entirely open for the full depth of the nut from top tobottom and for the full width of the opening, as

shown. It is made fiat at one side, as indicated at 5, for the purposeof providing a bearing for the inner face of the locking key 6 when ininoperative position. Said face 5 is so arranged to lie in a line orplane somewhat off-set from the axial center of the bolt to facilitatethe operation of the locking key in the manner hereinafter described.The other or opposite side or wall 7 of the opening 3 may be madeparallel with the side 5, while the intervening connecting walls arepreferably made in the manner indicated at 8 and 9, the wall 8 beingsubstantially at right angles to the wall 5 and extending therefrom toabout the center line of the nut, the wall 9 being sloped or curvedsomewhat inwardly toward the center of the nut, as shown.

The key 6 is equilaterally triangular in cross section having a fulcrumedge 10 and a biting edge 11 at each termination of the flat face 12which is adapted to confrontand bear against the surface 5 in screwingon the bolt, the other faces 13 and 14 converging toward the interveningedge 15, as shown.

It will be understood that the locking key is preferably made ofhardened steel and is adapted to fit snugly within the receiving space,with very slight or no clearance of the bolt threads, whereby to permitof the screwing on of the bolt without engagement. Upon reversal of thenut, however, the edge 11 immediately bites into the outer edges of thebolt threads, the key 6 then assuming the position indicated in Fig. 4and turning on its fulcrum edge 10 inwardly toward the center of thebolt and binding tightly and biting into the threads thereof, therebypositively preventing the further unscrewing of the nut.

An advantage in making the key 6 triangular and equilateral as shown, isthat it thus provides a plurality of equally spaced edges and may bechanged in position when one of the edges becomes worn.

If desired, means can be provided for positively holding the key 6 outof engagement with the threads of the bolt, as by inserting a wedge 16between the edge 15 of the key and the wall 7 of the cavity 3, as shownin Fig. 5. Any suitable device as a horse-shoe nail may be used for suchpurpose, and the biting edge 11 will thus be positively held out ofengagement with the threads, permitting unscrewing and removal of thenut.

If desired, the biting edge of the key may already described, mounted ina similar,

cavity 3, as clearly shown.

The advantages of the invention will be readily'appreciated by all thosefamiliar with this class of devices. 7

It is extremely simple, cheap in construction, very efiicient andpositive in operation, and possesses advantages over other forms ofWedging or rolling locking devices intended for the same purpose.

Having described our invention, What We claim and desire to secure byLetters Pat ent is:

In a nut lock, the combination of a nut edges bearing in said corner,the adjacent edge being adapted to engage the threads of a co-actingbolt, the intervening fiat face being adapted to bear upon the bearingface of the nut channel, substantially as setforth.

In testimony whereof We hereunto ,aflizr or signatures in the presenceof tWo Witnesses.

ROY A. BOWSER. HAMILTON D. BOVVSER.

Witnesses C. M. CLARKE,

FREDK. STAUB.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

